In this case, the subjunctive seems to predominate.
The largely equivalent phrase non point, in common written usage until
some time in the 1800s but nowadays rare, also triggers the subjunctive.

Subordinate clause can be paraphrased by cette situation etc

The subjunctive encapsulates a non-assertion or "imagined situation". So:

Verbs, nouns and adjectives that could have a phrase such
as cette situation, cette possibilité,
cette action as their object tend to trigger a subjunctive in
any subordinate clause that acts as their object.

Note that the clause must be paraphrasable and above all be a non-assertion.
A big clue in English is that a 'tenseless' verb construction such as
"for him to do it", "him doing it", "that he sould do it" is used rather than
a 'normal' verb ("he came", "he will come").
Contrast this with verbs that clearly introduce an assertion, such as
reported speech. In such cases, the verb in the subordinate clause remains in the
indicative:

Subordinate clause as the subject of the sentence

When a subordinate clause is the subject of a sentence, the subordinate generally
has its verb in the subjunctive.

Examples:

qu'il vienne est très importanthim coming is very importantqu'il ne puisse pas venir est regrettablehim not being able to come is regrettablequ'il ait dit ça m'a choquéthat he said that shocked mequ'il ne puisse pas venir s'explique très facilementhim not being able to come is easy to explainqu'elle puisse venir est très probableher being able to come is very probableSuggest a change / proposez une modification

It is common to switch such sentences round, so that the logical subject
isn't actually in the subject position of the sentence, and instead a
'dummy subject' (typically ça or il)
is inserted at the beginning of the sentence.
But the subordinate clause still generally takes the subjunctive:

ça m'a choqué qu'il ait dit çaI was shocked that he said thatil est très important qu'il vienneit is very important for him to começa s'explique très facilement qu'il ne puisse pas venirit is easy to explain him not being able to começa ne m'étonnerait pas qu'il vienne trop tardI wouldn't be surprised if he was too lateSuggest a change / proposez une modification

However, the subjunctive is overridden (but only in the 'switched round' sentence)
in cases where the subordinate clause
more clearly expresses an assertion, such as with adjectives évident,
probable:

Further circumstances triggering the subjective...

Notes

1. In informal speech, après (que) can actually trigger the
subjunctive, probably by analogy with avant (que).
2. The verb falloir actually provides some counter-evidence to
our notion of the subjunctive replacing a noun phrase paraphase. In informal speech,
it is possible to omit the subject il when the object is a clause,
but not, apparently, when it is a noun phrase: "(il) faut que tu réussisses"vs. "*(il) faut cette situation".